id:A090088 - OEIS Search Results

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Smallest even pseudoprimes to odd base=2n-1, not necessarily exceeding n. See also A007535 and A090086, A090087.

+0
3

4, 286, 4, 6, 4, 10, 4, 14, 4, 6, 4, 22, 4, 26, 4, 6, 4, 34, 4, 38, 4, 6, 4, 46, 4, 10, 4, 6, 4, 58, 4, 62, 4, 6, 4, 10, 4, 74, 4, 6, 4, 82, 4, 86, 4, 6, 4, 94, 4, 14, 4, 6, 4, 106, 4, 10, 4, 6, 4, 118, 4, 122, 4, 6, 4, 10, 4, 134, 4, 6, 4, 142, 4, 146, 4, 6, 4, 14, 4, 158, 4, 6, 4, 166, 4, 10 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`For an even base there are no even pseudoprimes.`
	FORMULA	`a(n)=Min{x=even number; Mod[ -1+n^(x-1), x]=0}`
	EXAMPLE	`n=2, 2n-2=3 as base, smallest relevant power is -1+2^(286-1) which is divisible with 286.`
	CROSSREFS	`Cf. A007535, A090986-A090089.` `Sequence in context: A134786 A074309 A113256 this_sequence A110816 A112322 A110071` `Adjacent sequences: A090085 A090086 A090087 this_sequence A090089 A090090 A090091`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 25 2003`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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